Pāṇini sūtras

ru is substituted for the m of pum (whereby the u is changed to u<> or uṁ) before a surd mute (khay) which is followed by a vowel, semivowel or a nasal (am pratyâhâra).

German Für das m von pum wird ru (und davor uṁ oder uṃ für u) substituirt vor einer tonlosen Muta mit darauf folgendem Vocal oder Halbvocal. (6)

1. pumaḥपुमः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   pप्	pumपुम्	pumaḥपुमः	puṃs [word]पुंस् [wओर्द्]	pumपुम् + plus aḥअः

2. kha+yiख+यि

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   kक्	khaख	khaख	khakāraखकार	khख् + plus aअ
   yय्	yय्	yiयि	YY	yय् + plus iइ

3. a+m+pareअ+म्+परे

   Part	Lexeme	Sandhi form	Meaning	Stem
   aअ	aअ	aअ	akāraअकार	aअ
   mम्	mम्	mम्	MM	mम्
   pप्	paraपर	pareपरे	following	paraपर

Anuvṛtti

1. ruरु 8·3·1

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   rर्	ruरु	ruरु	ruरु	rर् + plus uउ